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y in (-oo:+oo)
(3/4)*y = ((-3)^3)/8 // - ((-3)^3)/8
(3/4)*y-(((-3)^3)/8) = 0
(3/4)*y+(1/8)*3^3 = 0
3/4*y+27/8 = 0 // - 27/8
3/4*y = -27/8 // : 3/4
y = -27/8/3/4
y = -9/2
y = -9/2
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